Supong Chayutsahakij

Bangkok Expressway Public Co. Ltd. engages in the construction, design, and management of expressways. Its business operation includes Si Rat Expressway, Chalerm Mahanakorn Expressway, and Udon Ratthaya Expressway. It also provides expressway services like network map, communication and facilities, traffic management, and rescue and trailer services. The company was founded on December 23, 1987 and is headquartered in Bangkok, Thailand.

Bangkok Metro Public Co. Ltd. engages in the provision of metro services. It operates through the Mass Rapid Transit Authority of Thailand (MRTA) Initial System Project and Commercial Development Business segments. The Commercial Development Business segment includes rental of retail space, and the provision of advertising media services and telecommunication services in underground train stations. The company was founded on February 18, 1998 and is headquartered in Bangkok, Thailand.

Part of CK Power Public Co. Ltd., Nam Ngum 2 Power Co., Ltd. operates the Nam Ngum 2 hydro power plant. The private company is based in Vientiane, Lao People's Democratic Republic.

Part of CK Power Public Co. Ltd., Southeast Asia Energy Ltd. operates and manages hydroelectric power plants. The private company is based in Bangkok, Thailand. The CEO of the Thai company is Somkuan Watakeekul. Southeast Asia Energy was acquired by CK Power Public Co. Ltd. on June 27, 2011 for $109.21 million.